What Causes Irregular Periods,abdominal Bloating And Nausea After Having Unsafe Sex?

so on 2 July me and this guy were messing around. he rubbed his penis on my vagina but it did not go in. The tip only went in a little bit when he had the condom on. since this was on 2 July I got my period 11 days later on the 13th. I have a 34 day cycle and my period was supposed to arrive on the 18th instead of the 13th since my last period before that was June 14. it is now August 3. lately I ve been feeling bloated and slightly nauseated like randomly. i ve been bloated for three days straight so far. my friends say that it s my nerves or my period is just arriving soon and that s why I feel like this. i m really scared is there any chance that I could be pregnant?